Infiniti G35 (V35) Sedan. Manual — part 774
HAC-68
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MAGNET CLUTCH CONTROL SYSTEM
MAGNET CLUTCH CONTROL SYSTEM
Description
INFOID:0000000000959927
SYSTEM DESCRIPTION
Unified meter and A/C amp. controls compressor operation by ambient temperature, intake air temperature
and signal from ECM.
Magnet Clutch Circuit
Low Temperature Protection Control
Unified meter and A/C amp. will turn compressor ON or OFF as determined by a signal detected by ambient
sensor and intake sensor.
When ambient temperature is higher than
−
2
°
C (28
°
F), the compres-
sor turns ON. The compressor turns OFF when ambient temperature
is lower than
−
5
°
C (23
°
F).
When intake air temperature is higher than 1
°
C (34
°
F), the compres-
sor turns ON. The compressor turns OFF when intake air tempera-
ture is lower than
−
5
°
C (23
°
F).
JSIIA0141GB
RHA094GB
SJIA0267E
MODE DOOR MOTOR
HAC-69
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
COMPONENT DIAGNOSIS
MODE DOOR MOTOR
Description
INFOID:0000000000959928
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor (1) are attached to the heater & cooling unit
assembly. It rotates so that air is discharged from the outlet set by
the unified meter and A/C amp. Motor rotation is conveyed to a link
which activates the mode door.
Component Function Check
INFOID:0000000000959929
1.
CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK
1.
Press MODE switch(es) and DEF switch.
2.
Each position indicator should change shape.
3.
Confirm that discharge air comes out according to the air distribution table at below. Refer to
"WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM :
System Description"
(Without left and right ventilation temperature separately control system) or
"WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : System
Description"
(With left and right ventilation temperature separately control system).
NOTE:
Confirm that the compressor clutch is engaged (Sound or visual inspection) and intake door position is at FRE
when DEF
or D/F
is selected.
Is the inspection result normal?
YES
>> END.
NO
>> Go to diagnosis procedure. Refer to
Diagnosis Procedure
INFOID:0000000000959930
1.
PERFORM SELF-DIAGNOSIS STEP-2
Perform self-diagnosis STEP-2. Refer to
HAC-44, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system) or
HAC-50, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(With left and right ventilation temperature sepa-
rately control system), see No. 1 to 2.
Does code No. 20 appear on the display?
YES
>> GO TO 2.
NO
>> Go to appropriate malfunctioning sensor circuit. Refer to
HAC-44, "WITHOUT LEFT AND RIGHT
VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation temperature separately control system) or
AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis
Description"
(With left and right ventilation temperature separately control system), see No. 11.
2.
PERFORM SELF-DIAGNOSIS STEP-3
Perform self-diagnosis STEP-3. Refer to
HAC-44, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system)
HAC-50, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
:
Vehicle front
JSIIA0005GB
HAC-70
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(With left and right ventilation temperature sepa-
rately control system), see No. 1 to 3.
Does code No. 30 appear on the display?
YES
>> GO TO 8.
NO-1
>> Code No. 31 or 32 appear on the display: GO TO 3.
NO-2
>> Code No. 37, 38 or 39 appear on the display: Go to Intake Door Motor Circuit. Refer to
.
3.
CHECK POWER SUPPLY FOR UNIFIED METER AND A/C AMP.
1.
Turn ignition switch ON.
2.
Check voltage between unified meter and A/C amp. harness connector M67 terminal 70 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace unified meter and A/C amp.
4.
CHECK SIGNAL FOR UNIFIED METER AND A/C AMP.
Confirm A/C LAN signal between unified meter and A/C amp. harness connector M67 terminal 69 and ground
using an oscilloscope.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace unified meter and A/C amp.
5.
CHECK POWER SUPPLY FOR MODE DOOR MOTOR
Check voltage between mode door motor harness connector M253 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK SIGNAL FOR MODE DOOR MOTOR
Confirm A/C LAN signal between mode door motor harness connector M253 terminal 3 and ground using an
oscilloscope.
(+)
(
−
)
Voltage
Unified meter and A/C amp.
—
Connector
Terminal
M67
70
Ground
Battery voltage
(+)
(
−
)
Voltage
Unified meter and A/C amp.
—
Connector
Terminal
M67
69
Ground
SJIA1453J
(+)
(
−
)
Voltage
Mode door motor
—
Connector
Terminal
M253
1
Ground
Battery voltage
MODE DOOR MOTOR
HAC-71
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK MODE DOOR MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect mode door motor connector.
3.
Check continuity between mode door motor harness connector M253 terminal 2 and ground.
Is the inspection result normal?
YES
>> Replace mode door motor.
NO
>> Repair harness or connector.
8.
PERFORM SELF-DIAGNOSIS STEP-4
Perform self-diagnosis STEP-4. Refer to
HAC-44, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system)
HAC-50, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(With left and right ventilation temperature sepa-
rately control system), see No. 1 to 5.
Is it operated normally?
YES
>> END.
NO
>> GO TO 9.
9.
CHECK MODE DOOR CONTROL LINKAGE
Check mode door control linkage.
Is it installed normally?
YES
>> Refer to
.
NO
>> Repair or adjust control linkage.
(+)
(
−
)
Voltage
Mode door motor
—
Connector
Terminal
M253
3
Ground
SJIA1453J
(+)
(
−
)
Continuity
Mode door motor
—
Connector
Terminal
M253
2
Ground
Continuity should exist
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